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Income taxes - Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred tax assets: |  |
Non-capital loss, investment tax credits, currently non-deductible interest expenses, and financing costs | $ 761,666 | $ 531,353
Pension and OPEB | 46,580 | 66,826
Environmental obligation | 15,271 | 16,145
Regulatory liabilities | 166,939 | 168,054
Other | 64,460 | 65,787
Total deferred income tax assets | 1,054,916 | 848,165
Less: valuation allowance | (27,471) | (29,824)
Total deferred tax assets | 1,027,445 | 818,341
Deferred tax liabilities: |  |
Property, plant and equipment | 782,829 | 733,211
Outside basis differentials | 412,665 | 406,429
Regulatory accounts | 300,072 | 212,937
Other | 30,471 | 12,528
Total deferred tax liabilities | 1,526,037 | 1,365,105
Net deferred tax liabilities | (498,592) | (546,764)
Deferred tax assets | 31,595 | 21,880
Deferred tax liabilities | $ (530,187) | $ (568,644)

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